I tried really hard to pick one, but felt I couldn't, as there were too many aspects of all of them that I couldn't live with. I would end up redecorating all of them.
Then I thought there must be a way to answer the question. So I imagined I was at a hotel or similar, and was told these are the last four rooms left. Which one would i take for a few days?
In the end, I went with D. D looks calm to me, and I like the natural light. I almost went with C, but wished it all looked paler. Either way, at least eventually I could leave, and forget all about it.